I am trying to do the following in the field calculator in ArcGIS 10

if  [IncdStDir] = " " then [IncdStNo] &" " & [IncdStName] &" " & [IncdStSfx]

else  [IncdStNo] &" " & [IncdStDir]&" " & [IncdStName] &" " & [IncdStSfx]

end if

I keep getting an error when I try to run this. I am new to Vb.

  • 1
    What is the error message you're getting in the Geoprocessing-Results window? Commented Jun 30, 2011 at 15:52

3 Answers 3


Updated code as @Russell Mercer suggested.

Make sure you have the advanced checkbox checked and are calculating on the field you want the result posted to. Try this:

Dim output

if  [IncdStDir] = " " then
output = [IncdStNo] & " " & [IncdStName] & " " & [IncdStSfx]


output = [IncdStNo] & " " & [IncdStDir] & " " & [IncdStName] & " " & [IncdStSfx]

end if

And include output variable in the Prelogic section.

  • That did not work. I put the Dimo output as string in the Pre-logic section and then I copied your text in to the other section. Do I also have to put the Dim part in there as well?
    – alicia
    Commented Jun 30, 2011 at 16:20
  • The parser in ArcMap is a little quirky at times. Try adding a space after all ampersands (so, & " " instead of &" ") to see if that helps. As long as all of those columns actually exist in the layer, nothing else looks wrong. Commented Jun 30, 2011 at 16:52
  • I have tried that and that did not work.
    – alicia
    Commented Jun 30, 2011 at 17:00
  • @alicia Have you looked at the error message in Results? That might provide a hint in the right direction. Commented Jun 30, 2011 at 17:24
  • 2
    @alicia - I just read today something about declaring variables using VBScript in ArcGIS 10. Variables are all declared as variant, so declaring a variable as "Dim output as string" will throw an error. The recommendation from the ESRI moderator was to change that to "Dim output" I don't have confirmation that this works, but your error matches the error others were reporting for the same circumstance. Commented Jul 1, 2011 at 0:40

Your Else clause doesn't have an = sign. You're not setting anything there, just concatenating fields. You need to set a value, call a function, or do something (technically you could leave the else clause blank, but that would be pointless). Just concatenating fields without setting a variable to them isn't a valid statement within the clause.

  • and by "= sign" you mean an assignment operator (as VB has overloaded this operator with equality)
    – Mike T
    Commented Aug 1, 2011 at 19:45

You said you "put the Dimo output as string in the Pre-logic section and then I copied your text in to the other section". This is not correct for the field calculator.

Paste all of the code from "Dim output..." to "...End If" in the Pre-logic section. The only text in the other section should be output.

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